Zimmermann 400.3654.20 Disc Brake Rotor - Front

Zimmermann 400.3654.20 Front Brake Rotor

The Zimmermann 400.3654.20 is a perforated front disc brake rotor built to OE-equivalent dimensions and material quality for select Mercedes-Benz applications. It features a coated surface for improved corrosion resistance and a high-carbon machining specification for stable braking performance.

Key Features

• Part number: 400.3654.20
• Brand: Zimmermann
• Disc brake rotor with perforated design
• Coated surface for added corrosion protection
• High-carbon machining specification
• Outer diameter: 322 mm
• Thickness: 32 mm; minimum thickness: 30 mm
• Height: 64.5 mm
• Bolt hole circle: 112 mm
• Hub bore: 67 mm
• 6/5 hole arrangement

Detailed Description

Zimmermann brake rotors are manufactured to the dimensions and material quality specified by vehicle manufacturers, making this rotor a direct OE-style replacement for front brake service. The perforated rotor design and coated surface support consistent braking performance while helping maintain a cleaner, more corrosion-resistant finish. This part number 400.3654.20 is listed for Mercedes-Benz E-Class and C-Class models with sport or AMG sport brake packages, including front applications on Mercedes-Benz E250, E300, E350, E400, C300, C350, and S400L configurations shown in the fitment data.

This part cross-references Brembo 09.A621.31 for the same application.

What It Is Used For

• Front brake rotor replacement when the original disc is worn below service limits
• Correction of brake pulsation caused by rotor wear or thickness variation
• Restoring braking feel on Mercedes-Benz E-Class, C-Class, and S400L front axle applications
• Replacing a corroded or visually degraded rotor surface
• Maintaining proper brake disc thickness and heat management on sport-package vehicles

Installation Notes and Tips

Verify rotor dimensions, hub bore, bolt pattern, and minimum thickness before installation. This rotor is listed for front position applications only and is tied to specific Mercedes-Benz sport package and AMG sport package configurations. Confirm vehicle equipment details, including AMG Sports Package, Sport Package, or Sport Brake Retrofit notes, before ordering. Always inspect pads, calipers, and wheel hub condition during brake service, and measure the new rotor after installation to confirm it remains above minimum thickness.

Quality Assurance

Zimmermann standard brake rotors are produced as OE-equivalent replacement parts under EU motor vehicle block exemption standards, with dimensions and material quality aligned to the original specification. The coated finish reflects Zimmermann’s Coat Z anti-corrosion approach for improved surface protection.